Public Domain Switch

I accidentally uploaded a piece into the public domain when it shouldn't have been. Numerous times, I have went to the "Update this piece" section and toggled the piece so that it is not in public domain anymore. However, Musescore still tells me that the piece is in public domain. What should I do?

The piece is called Rocket Barrel 1: https://musescore.com/user/14142051/scores/5754388